//
// Created by Jack Gao on 20/7/2018.
//

#include <ngx_core.h>
#include <ngx_conf_file.h>
#include <ngx_http.h>
#include <ngx_http_config.h>
#include <ngx_http_core_module.h>

static char *ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);

static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r);

static ngx_command_t ngx_http_mytest_commands[] = {

        {
                ngx_string("mytest"),
                NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF |
                NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS,
                ngx_http_mytest,
                NGX_HTTP_LOC_CONF_OFFSET,
                0,
                NULL
        },

        ngx_null_command
};

static char *ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) {

    ngx_http_core_loc_conf_t *clcf;

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);

    clcf->handler = ngx_http_mytest_handler;

    return NGX_CONF_OK;
}

static ngx_http_module_t ngx_http_mytest_module_ctx = {
        NULL,
        NULL,

        NULL,
        NULL,

        NULL,
        NULL,

        NULL,
        NULL
};

ngx_module_t ngx_http_mytest_module = {
        NGX_MODULE_V1,
        &ngx_http_mytest_module_ctx,
        ngx_http_mytest_commands,
        NGX_HTTP_MODULE,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NGX_MODULE_V1_PADDING
};

static ngx_int_t ngx_http_mytest_handler(ngx_http_request_t *r) {
    if (!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD))) {
        return NGX_HTTP_NOT_ALLOWED;
    }

    ngx_int_t rc = ngx_http_discard_request_body(r);
    if (rc != NGX_OK) {
        return rc;
    }

    ngx_str_t type = ngx_string("text/plain");
    ngx_str_t response = ngx_string("Hello World!");
    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = response.len;
    r->headers_out.content_type = type;

    rc = ngx_http_send_header(r);
    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
        return rc;
    }

    ngx_buf_t *b;
    b = ngx_create_temp_buf(r->pool, response.len);
    if (b == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    ngx_memcpy(b->pos, response.data, response.len);
    b->last = b->pos + response.len;
    b->last_buf = 1;

    ngx_chain_t out;
    out.buf = b;
    out.next = NULL;

    return ngx_http_output_filter(r, &out);
}

